density monitoring Articles

  • Minimum and Maximum Densities of Granular Materials

    Laboratory tests were conducted to determine minimum and maximum densities of arroyo sand, concrete sand, Ottawa sand, and glass beads. Minimum densities were determined by six different methods using two different molds. Maximum density tests were performed using an electromagnetic vibrator producing vertical simple harmonic motion. The vibration parameters investigated were frequency, ...


    By ASTM International

  • Total Stress Probe Determination of Clay Slurry Density

    The progress of sedimentation, self-weight consolidation, and gain in surface strength of a hydraulic clay fill were observed by monitoring the density improvement of the clay slurry with time. A practical method of measuring the in situ slurry density profile with depth is to employ a submersible gamma-source, backscattertype nuclear density gauge. A slurry consolidation test in the laboratory ...


    By ASTM International

  • Productivity and density of belted kingfishers on the Housatonic river, Massachusetts

    Belted kingfishers (Ceryle alcyon) breeding along the Housatonic River (Massachusetts) were studied to determine whether productivity or population density is impaired, in light of the presence of polychlorinated biphenyls (PCBs) in their prey. The study involved: a) characterizing habitat quality; b) identifying kingfisher burrows; c) monitoring breeding pairs from courtship through fledging; d) ...


    By Arcadis

  • Ultrasonic density measurement of uranium loaded organic phase in solvent extraction process

    The application of ultrasound technique in density determination of uranium loaded organic phase in solvent extraction can provide a unique solution for online density monitoring of process streams. Earlier various authors have investigated the density measurement of liquid by single ultrasound frequency. In general standard reference liquid (having low viscosity and density) is used for ...


    By Inderscience Publishers

  • Influence of wastewater disinfection on densities of culturable fecal indicator bacteria and genetic markers

    The US Environmental Protection Agency has proposed the use of quantitative polymerase chain reaction (qPCR) as a rapid alternative analytical method for monitoring recreational water quality at beaches. For qPCR to be considered for other Clean Water Act purposes, such as inclusion in discharge permits and use in Total Maximum Daily Load calculations, it is necessary to understand how qPCR ...


    By IWA Publishing

  • Antibiotics in groundwater under locations with high livestock density in Germany

    Antibiotics are deployed in large quantities both in human and in veterinary medicine. Studies show that antibiotic residues occur in the environment (e.g. soil and surface waters). In some cases they were also detected in ground and drinking water. However, the degree of groundwater pollution by antibiotic residues from livestock farming is unknown. Therefore, the federal environment agency ...


    By IWA Publishing

  • From macroplastic to microplastic: Degradation of high‐density polyethylene, polypropylene, and polystyrene in a salt marsh habitat

    As part of the degradation process, it is believed that most plastic debris becomes brittle over time, fragmenting into progressively smaller particles. The smallest of these particles, known as microplastics, have been receiving increased attention because of the hazards they present to wildlife. To understand the process of plastic degradation in an intertidal salt marsh habitat, strips ...


    By John Wiley & Sons, Ltd.

  • Fluctuation of densities of bacteriophages and Escherichia coli present in natural biofilms and water of a main channel and a small tributary

    Fluctuation of bacteriophage and Escherichia coli densities in naturally developed riverbed biofilms were investigated for a 1-year period. E. coli ranged from 1,500 to 15,500 most probable number (MPN)/100 mL and from 580 to 18,500 MPN/cm2 in the main channel in the river water and biofilms, respectively. However, the fluctuations were much greater in the ...


    By IWA Publishing

  • Construction and Civil Infrastructures Monitoring Systems

    Civil infrastructures are usually monitored through its whole life cycle. SHM (Structural Health Monitoring) technologies enable the estimation of the structural state and detection of structural change that affects the performance of a structure. Two discriminating factors in SHM are the time-scale of the change (how quickly the state changes) and the severity of the change. These factors ...

  • Air quality monitoring: establishing criteria for station classification

    According to the Council Decision 97/101/EC on Exchange of Information, stations should be classified in relation to the type of area where they are located and according to the type of dominant emission sources influencing the air pollutant concentrations at the station. A detailed methodology was developed for the validation of the classification of Portuguese air quality monitoring stations, ...


    By Inderscience Publishers

  • Monitor Dredging Slurry Flow from Outside the Pipe

    Dredging Equipment Manufacturers Choose Non-Contacting Greyline Flow Meters The Challenge Thousands of dredges are operated to maintain navigation channels in our rivers, lakes and harbours and to mine sand and gravel for the construction industry. Managing and optimizing production from a dredge requires continuous monitoring of pipeline pressure, vacuum ...


    By Greyline Instruments Inc.

  • Cartography for air quality monitoring: the geostatistical approach

    Being able to provide quick and accurate pollutant maps from readings at isolated measurement stations is becoming more important today in light of the European norms on air quality and the public’s demand to be informed. Commonly used algorithms for cartography are quick but their accuracy remains to be determined.Firstly, the choice of method is arbitrary and based on user’s subjective ...


    By GEOVARIANCES

  • New Condition Monitoring and Analysis System VDAU-6000

    Brüel & Kjær Vibro announces the world-wide release of the new VDAU-6000. This state-of-the-art condition monitoring system provides an economical alternative to rack-based systems for condition monitoring of rotating machinery, in particular auxiliary machines and balance-of-plant applications. The high density 16-channel parallel processing functionality also lends itself to the ...


    By Brüel & Kjær Vibro GmbH

  • Optimal groundwater contamination monitoring using pumping wells

    This study presents a new method for selecting monitoring wells for optimal evaluation of groundwater quality. The basic approach of this work is motivated by difficulties in interpolating groundwater quality from information collected for only few sampled wells. The well selection relies on other existing data relevant to contaminant distribution in the sampling domain, e.g. predictions of ...


    By IWA Publishing

  • Copernicus: new horizons for European and global land monitoring

    How can we monitor Europe-wide farmland biodiversity so that it makes sense to farmers, is ecologically credible and still is affordable? Two new studies published in the Journal of Applied Ecology and the Journal of Environmental Management think it is possible. These studies were conducted by international groups of scientists including Alterra. Combining stakeholder priorities for biodiversity ...

  • A new monitoring method of CRVI in water using boron-doped diamond microelectrodes

    Boron doped diamond electrodes were used for the amperometric measurement of chromiumVI in water. A linear relationship of the current density as a function of the chromiumVI concentration was observed for concentrations comprised between 50 ppb and 4 ppm. Such results are particularly promising for the monitoring of chromiumVI in liquid effluents or process baths of several industries (stainless ...


  • Automatic Sludge Blanket Level Detector: Monitor & control for effective, efficient processing

    Reducing energy consumption at municipal and industrial plants is, increasingly, a priority. Markland Specialty Engineering Ltd., designing and manufacturing process control instrumentation since 1967, helps achieve this important goal with its Automatic Sludge Blanket Level Detector. By helping facilities reduce waste - reducing unnecessary water, chemical or energy use, and unnecessary ...

  • Monitoring Air/Fuel Mixtures in Glass and Glass Fiber Manufacturing case study

    Measurement of Premix Gas. To produce the desired flame in a glass forehearth or when making fiberglass (glass fiber) insulation, an air/fuel pre-mixer is used. The pre-mixer combines compressed natural gas or propane with air and this mixture is then piped to the process burners At the burner, a fuelrich or fuel-lean flame is produced depending on the air/ fuel ratio selected. In many ...

  • A novel acoustic imaging tool for monitoring the state of rapid sand filters

    A new technology based on acoustic waves is developed to monitor the state of sand filters used in drinking water treatment. Changes in the sand filter, due to the removal of suspended particles from the water and their accumulation in the pores, result in an increase of the bulk density and acoustic speed of the granular material. Consequently, the reflected acoustic response changes as the ...


    By IWA Publishing

  • Basewide Monitoring & Innovative Remedial Systems Beale Air Force Base

    Basewide Monitoring and Innovative Remedial Systems Project Description Facing a twofold problem involving highly contaminated soil and groundwater in a sensitive habitat area, the Environmental Restoration Team at Beale Air Force Base designed a habitat enhancing solution to stop contamination from degrading groundwater and a stream in the area. In 1995, the U.S. Air Force discovered ...


    By CH2M Hill Companies, Ltd.

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